1. Stress versus rupture life data for a superalloy are listed below in Table 1. The stresses are given in MPa and rupture life is given in hours. Rupture time (h) Stress MPa 500°C 600°C 700°C 800°C 600 2.8 0.018 0.0005 500 250.0 0.72 0.004 400 12.1 0.082 0.00205 300 180.0 0.87 0.011 200 2412.0 11.0 0.198 100 98.0 1.10 (a) Make a plot of stress (log scale) versus PLM, where PLM = (T)(C + log 10t). T is the temperature in kelvin, t is in hours, and C = 20. (b) Make a plot of the Sherby-Dorn parameter, Psp = log100, where 0 = texp(-) and Q = 340 kJ/mole. (c) Using the two plot obtained from (a) and (b), predict what stress would cause rupture in 100,000 h at 450°C?